IS/ISO 7768: Textiles - Test Method for Assessing the Smoothness Appearance of Fabrics After Cleansing

2009·1.2 MB·English

by  Bureau of Indian Standards

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IS/ISO 7768 (2009): Textiles - Test Method for Assessing
the Smoothness Appearance of Fabrics After Cleansing [TXD
1: Physical Methods of Tests]
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IS/ISO 7768 : 2009
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Indian Standard
TEXTILES — TEST METHOD FOR ASSESSING
THE SMOOTHNESS APPEARANCE OF FABRICS
AFTER CLEANSING
ICS 59.080.30
© BIS 2013
B U R E A U O F I N D I A N S T A N D A R D S
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
March 2013 Price Group 7
Physical Methods of Test Sectional Committee, TXD 01
NATIONAL FOREWORD
This Indian Standard which is identical with ISO 7768 : 2009 ‘Textiles — Test method for assessing
the smoothness appearance of fabrics after cleansing’ issued by the International Organization for
Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the
Physical Methods of Test Sectional Committee and approval of the Textile Division Council.
The text of ISO Standard has been approved as suitable for publication as an Indian Standard without
deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention
is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should be
read as ‘Indian Standard’.
b) Comma (,) has been used as a decimal marker while in Indian Standards the current practice
is to use a point (.) as the decimal marker.
In this adopted standard, reference appears to certain International Standards for which Indian
Standards also exist. The corresponding Indian Standards which are to be substituted in their respective
places are listed below along with their degree of equivalence for the editions indicated:
International Standard Corresponding Indian Standard Degree of Equivalence
ISO 105-A03 : 1993 Textiles — Tests IS/ISO 105-A03 : 1993 Textiles — Identical
for colour fastness — Part A03: Grey Tests for colour fastness: Part A03
scale for assessing staining Grey scale for assessing staining
ISO 139 Textiles — Standard IS 6359 : 1971 Method for conditioning Technically Equivalent
atmospheres for conditioning and of textiles
testing
ISO 6330 : 2000 Textiles — Domestic IS 15370 : 2005 Textiles — Domestic Identical
washing and drying procedures for washing and drying procedures for
textile testing textile testing
The technical committee has reviewed the provisions of the following International Standards referred
in this adopted standard and has decided that they are acceptable for use in conjunction with this
standard:
International Standard Title
ISO 3175-1 : 2010 Textiles — Professional care, drycleaning and wetcleaning of fabrics and
garments — Part 1: Assessment of performance after cleaning and
finishing
ISO 3175-2 : 2010 Textiles — Professional care, drycleaning and wetcleaning of fabrics and
garments — Part 2: Procedure for testing performance when cleaning
and finishing using tetrachloroethene
ISO 3175-3 : 2003 Textiles — Professional care, drycleaning and wetcleaning of fabrics and
garments — Part 3: Procedure for testing performance when cleaning
and finishing using hydrocarbon solvents
ISO 3175-4 : 2003 Textiles — Professional care, drycleaning and wetcleaning of fabrics and
garments — Part 4: Procedure for testing performance when cleaning
and finishing using simulated wetcleaning
In reporting the result of a test or analysis made in accordance with this standard, if the final value,

observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 ‘Rules for
rounding off numerical values (revised)’.
IS/ISO 7768 : 2009

Indian Standard
TEXTILES — TEST METHOD FOR ASSESSING
THE SMOOTHNESS APPEARANCE OF FABRICS
AFTER CLEANSING
1 Scope
This International Standard specifies a method for assessing the retention of the original smooth appearance,
after one or several cleansing treatments, of the fabrics tested.
This method has been developed for use primarily with Type B domestic washing machines, as defined in
ISO 6330, in the cleansing process. However, it may be possible to use it with Type A machines, as defined in
the same International Standard. This test method could be used for judging smoothness appearance after
other cleansing processes.
NOTE It is recognized that prints and patterns will mask the mussiness present in fabrics. However, this does not
detract from the smoothness appearance concept which seeks to provide the consumer with fabrics which require little or
no ironing.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 105-A03, Textiles — Tests for colour fastness — Part A03: Grey scale for assessing staining
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 3175 (all parts), Textiles — Professional care, drycleaning and wetcleaning of fabrics and garments
ISO 6330, Textiles — Domestic washing and drying procedures for textile testing
3 Principle
Fabric specimens are subjected to procedures simulating cleansing practices. One of the domestic washing
and drying procedures specified in ISO 6330 or one of the professional procedures specified in the series of
ISO 3175 is used, as agreed between the interested parties.
4 Apparatus
4.1 Washing and drying apparatus, as specified in ISO 6330, or professional care apparatus, as
specified in ISO 3175.
4.2 Lighting.
The evaluation area shall be a darkened room, using the overhead lighting arrangement shown in Figure 1

and comprising the following items. Lamp dimensions should be chosen to extend beyond the overall surface
of a test specimen and replicas, when used for the assessment.
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IS/ISO 7768 : 2009
4.2.1 Two CW (cool white) fluorescent lamps, without baffle or glass, a minimum of 2 m in length each,
placed side by side.
4.2.2 One white enamel reflector, without baffle or glass.
4.2.3 One specimen holder.
4.2.4 One thick plywood viewing board, painted grey to match the No. 2 rating on the grey scale for
assessing staining specified in ISO 105-A03.
4.3 Three-dimensional smoothness appearance replicas (see Figure 2) 1).
NOTE A digital description of the ISO smoothness replicas is given in Annex B.
Dimensions in metres

Key
1 replica
2 test specimen
3 board for viewing
4 example of fluorescent lamp placement
Figure 1 — Lighting equipment for viewing test specimens

1) The replicas shown in Figure 2 are for illustrative purposes only. These replicas may be obtained from AATCC
Technical Center, One Davis Drive, P.O. Box 12215, Research Triangle Park, North Carolina 27709-2215 USA;
Tel: [phone]; Fax: [phone]; http://www.aatcc.org. This information is given for the convenience of users

of this document and does not constitute an endorsement by ISO of the product named. Equivalent products may be used
if they can be shown to lead to the same results.
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IS/ISO 7768 : 2009

Figure 2 — Three-dimensional smoothness appearance replicas
5 Test specimens
Prepare three test specimens, each measuring 38 cm × 38 cm, cut parallel to the length direction, pinked to
prevent fraying and marked to indicate the length direction.
6 Procedure
6.1 Treat each specimen according to one of the cleansing procedures specified in ISO 6330 or ISO 3175,
as agreed between the interested parties.
6.2 If required, repeat the selected treatment four times, to give a total of five cycles.
6.3 Condition the test specimens for a minimum of 4 h and maximum of 24 h, according to ISO 139, by
hanging each specimen unfolded with the length direction vertical to avoid distortion.
6.4 For the evaluation, carry out steps 6.4.1 to 6.4.5.
6.4.1 Three observers shall rate each treated test specimen independently.
6.4.2 Mount the test specimen on the viewing board (4.2.4) as illustrated in Figure 1, with the length
direction vertical. Place the three-dimensiona l plastic replicas (4.3) on each side of the test specimen to
facilitate comparative rating.
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IS/ISO 7768 : 2009
The overhead fluorescent light (4.2.1) shall be the only light source for the viewing board, and all other lights
in the room shall be turned off. It has been the experience of many observers that the light reflected from the
side walls near the viewing board can interfere with the rating results. It is recommended that the side walls be
painted black or that blackout curtains be mounted on either side of the viewing board to eliminate the
reflective interference.
6.4.3 The observer shall stand directly in front of the specimen, 1,2 m away from the board. It has been
found that normal variations in the height of the observer above and below the arbitrary 1,5 m eye level have
no significant effect on the rating given.
6.4.4 Assign the number of the replica which most nearly matches the appearance of the test specimen, or
assign ratings midway between those whole-number standards which have no half-number standards
separating them if the appearance of the specimens warrants it (see Table 1).
An SA-5 rating is equivalent to the SA-5 replica and represents the smoothest appearance and best retention
of original appearance, while an SA-1 rating is equivalent to the SA-1 replica and represents the poorest
appearance and poorest retention of original appearance.
6.4.5 Similarly, the observer shall independently rate each of the other two test specimens. The other two
observers shall proceed in the same manner, assigning ratings independently.
Table 1 — Fabric smoothness ratings
Rating Appearance
SA-5 Equivalent to the SA-5 replica
4,5 Midway between Standard SA-4 and SA-5
SA-4 Equivalent to the SA-4 replica
SA-3,5 Equivalent to the SA-3,5 replica
SA-3 Equivalent to the SA-3 replica
2,5 Midway between Standard SA-2 and SA-3
SA-2 Equivalent to the SA-2 replica
1,5 Midway between Standard SA-1 and SA-2
SA-1 Equivalent to or worse than the SA-1 replica
7 Expression of results
Average the nine observations made by the three observers on the set of three test specimens. Report the
average to the nearest half rating.
NOTE Data on precision and accuracy are given in Annex A. Because the test procedure described is subjective and
ordinal ratings are given, statistics that use frequency distribution as a basis were applied to the data.
8 Test report
The test report shall include the following information:
a) a reference to this International Standard (ISO 7768:2009);
b) details of the sample evaluated;

c) details of the cleansing procedures used;
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IS/ISO 7768 : 2009
d) the number of cleansing cycles used;
e) the fabric smoothness rating as calculated according to Clause 7 and expressed according to Table 1;
f) details of any deviation from the specified procedure.

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